... what the air suction valve (or so it is called in the haynes manual) is and/or does. It is the ~1" diameter hard tube coming off of the head right at the exhaust manifold. I think I'm getting some fluid coming down there. No idea how or why, but I pulled the exhaust pipe off as soon as it cooled down and there is a wet patch right where that tube ties into the head.

cheers

it puts fresh air into the exhaust to make the cat more efficient, my cat's rotten, so I disabled mine, I disconnected, and plugged everything going into them.